Darley is a suburb of Bacchus Marsh, Victoria, Australia located directly north of the central area across the Western Freeway.

It is bordered by the Lerderderg River to the east, Korkuperrimui Creek to the west, Western Freeway to the south and Lerderderg State Park to the north. Darley is located on the rural urban fringe, the topography varies but is mostly undulating.

In recent decades Darley has rapidly grown and has become a major suburban area of Bacchus Marsh with a large number of housing estates and developments to the east south and north capitalising on Darley's proximity to the freeway.

The suburb is home to Darley Primary School, Pentland Hills Primary School, large sports oval (Darley Oval) home to the Darley Football Club, the Bacchus Marsh Golf club, IGA supermarket and small commercial centre on Albert Street.

Darley is also home to many walking and hiking tracks in the Lerderderg Gorge area and has spectacular views reaching all the way to the Melbourne city skyline on a clear day.